[crunchymilk55]

thank you for doing a bit of research first. when it comes to exhaust components you forgot one thing. The turbo connects to the 02 housing, the 02 housing connects to the downpipe. The 02 housing can accept 2.5 or 3 inch, it doesn't matter, they both fit. I suggest the 3" exhaust, and just port the turbo and manifold, there are threads on how to do this already. Also when people mention a turbo back exhaust, they usually mean an 02 housing as well, you can get 02 housing's that flow better than stock, or just port yours.